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4. D. E. Men’shov, ‘‘On convergence in measure of trigonometric series,’’ Tr. Mat. Inst., Akad. Nauk SSSR 32, 3–97 (1950).
5. A. A. Talalyan, ‘‘Trigonometric series which are universal with respect to subseries,’’ Izv. Akad. Nauk SSSR, Ser. Mat. 27 (3), 621–660 (1963).